Question about 2003 Infiniti FX35

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Burns oil on start up only

My 2003 Infiniti FX 35 seems to only burn oil on start up...I have followed the vehichle and can't notice any Blue smoke whatsoever during moderate or even extreme acceleration. However when it sits overnight it smokes terribly on start up for about 1 minute or so. I cant imagine how oil appears to be entering into the Number one combustion chamber when shut off, but not when running under even extreme acceleration. I have confirmed the number one cylinder since it is the only spark plug continuing to foul out from deposits, while the other 5 all burn light tan as expected.....The dealer is saying the valve seals are the issue. It seems odd that a defective seal would not allow oil to pass while the engine is hot and operatiing while being fully lubricated but somehow allows oil to seap past an elevated valve stem mount in the head while shut down. The car uses about 1/2 -1 QT per week with only being run 100 miles or so... the amazing thing is I can drive the car 300 miles on a trip and not be low even a fraction of oil as long as I fill it before beginning the trip. So clearly the seals are functioning duirng operation..Thanks for any insight you may have.. Doug Robison

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  • Anonymous May 26, 2009

    every morning i go to start my 1996 1.5 lit 4 cyl mazda protege and every time it burns alot of oil but only for a few sec and then it stops and while on my way to work i wonder why my car dosen't burn the oil while i am driving fast like 80mph . i have ask around and some mech say the piston rings need replaced and they need to do alot of things to the block its self to fix it at which it will cost me about $2000.00 dollars and if anybody has a solution i am open to any ideas that will lead to a fix thanks.

  • Anonymous Mar 26, 2014

    It has 155,000 miles. It has almost always had Infiniti dealer service. But most of the time it smokes for 30 to 90 seconds when it's first started for the day, and the temperature is below 70 degrees. And it smells like burnt oil. It also uses a quart of oil about every 500 miles. But it doesn't leak any oil. So what are the most common causes, from most likely, to least likely?

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The dealer is right its a valve stem seal, when it sets valve not moving oil when hot will seap down thru valve seal into combustion chamber hense oil smoke when you start it up. its burning oil when your going down the road you just cannot see it because its such a mynute amount, because oil is moving and dosent get a chance to run into cyl. like it does when its setting, but its burning it. if its fouling a plug its bad and may be more than just a valve like maybe oil ring on piston. i got 40+ years of experance working on autos and trucks and if its using that much oil in just 100 mi. you got to be seeing something.

Posted on Jan 26, 2009

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It is doubtful the replacements you have so far carried out will have changed anything and it is likely to be coincidence the colour of the smoke has changed.

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